<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<script>
    let hello = function() {
        alert("111");
    }

    let hello2 = (t)=> {
        alert(t);
    }

    hello()

    hello2('你好')

</script>


</body>
</html>